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None of this have anything to do with cold start . If plugged fuel filter it would be a problem hot or cold , IAC problem would cause an erratic idle . You need to have your vehicle hooked up to a scan tool that reads sensor data ! A engine coolant temp sensor could be a problem , mass air flow sensor , Solving Cold Start Problems 1999 GMC Jimmy EricTheCarGuy Doesn't matter this is a chevy an you have a kia , internal combustion engine all run on same principle, so rather then just replacing parts take it an have it diagnosed .
Edwin the code you have P1115 has to do with the engine coolant temperature sensor circuit. When you have a code that directs you to a circuit that means it could be a wiring issue, a connector issue or the part that the wiring runs to, which is the coolant sensor. When the engine first starts the computer uses the coolant sensor to provide the correct amount of fuel so the engine runs properly. Here's what you need to do first. Check all related wiring for damage and also check the connector for pin-push-outs. If everything looks good then replace the coolant temp sensor. Hope this helps and have an awesome day Edwin.
Clean the temperature sensor wire connector. Replace the temp sensor. Check the condition of the sensor wire cut(s) or short onto the engine block. Monitor the fan operation with the hood open during warm up (0-15 minutes.) It should ran after the engine coolant temp get above 195F +.
Check,clean or change the air filter and breather element.
Cheak to see that the coolant fan is operating with the A/C turned on. The fan has to work to help the engine stay cool and help the A/C. When you apply heat on the control it acts to reduce the coolant temp. You will have to get the coolant fan operation checked. This can be :fan motor, fan relay, temp sensor and computer. Good luck